Progenitor and Close-In Circumstellar Medium of Type II Supernova 2020fqv from High-Cadence Photometry and Ultra-Rapid UV Spectroscopy

Abstract

We present observations of SN 2020fqv, a Virgo-cluster Type II core-collapse supernova (CCSN) with a high temporal resolution light curve from the Transiting Exoplanet Survey Satellite (TESS) covering the time of explosion; ultraviolet (UV) spectroscopy from the Hubble Space Telescope (HST) starting 3.3 days post-explosion; ground-based spectroscopic observations starting 1.1~days post-explosion; along with extensive photometric observations. Massive stars have complicated mass-loss histories leading up to their death as CCSNe, creating circumstellar medium (CSM) with which the SNe interact. Observations during the first few days post-explosion can provide important information about the mass-loss rate during the late stages of stellar evolution. Model fits to the quasi-bolometric light curve of SN 2020fqv reveal ~0.23 $M_{\odot }$ of CSM confined within ~1450 $R_{\odot }$ ($10^{14}$ cm) from its progenitor star. Early spectra (<4 days post-explosion), both from HST and ground-based observatories, show emission features from high-ionization metal species from the outer, optically thin part of this CSM. We find that the CSM is consistent with an eruption caused by the injection of $\sim$$5\times 10^{46}$ erg into the stellar envelope $\sim$300 days pre-explosion, potentially from a nuclear burning instability at the onset of oxygen burning. Light-curve fitting, nebular spectroscopy, and pre-explosion \textit{HST} imaging consistently point to a red supergiant (RSG) progenitor with $M_{\mathrm{ZAMS}}$$\approx$$13.5$--$15M_{\odot }$, typical for SN~II progenitor stars. This finding demonstrates that a typical RSG, like the progenitor of SN 2020fqv, has a complicated mass-loss history immediately before core collapse.

Published in MNRAS

References in corpus (40)

• The Transiting Exoplanet Survey Satellite
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The death of massive stars - I. Observational constraints on the progenitors of type II-P supernovae
• Observational constraints on the progenitors of core-collapse supernovae : the case for missing high mass stars
• A giant outburst two years before the core-collapse of a massive star
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral observations of a wind
• SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium
• SN 2005cs in M51 II. Complete Evolution in the Optical and the Near-Infrared
• Kinematics of the Local Universe XIII. 21-cm line measurements of 452 galaxies with the Nançay radiotelescope, JHK Tully-Fisher relation and preliminary maps of the peculiar velocity field
• Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
• Red supergiants as potential Type IIn supernova progenitors: Spatially resolved 4.6 micron CO emission around VY CMa and Betelgeuse
• Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
• The Initial Masses of the Red Supergiant Progenitors to Type-II Supernovae
• The type IIb SN 2008ax: the nature of the progenitor
• The `Red Supergiant Problem': the upper luminosity boundary of type-II supernova progenitors
• Ultraviolet Spectroscopy of Supernovae: The First Two Years of Swift Observations
• A Diversity of Wave-driven Pre-supernova Outbursts
• Progenitor mass of the type IIP supernova 2005cs
• A Cool and Inflated Progenitor Candidate for the Type Ib Supernova 2019yvr at 2.6 Years Before Explosion
• The Type II-P Supernova 2017eaw: from explosion to the nebular phase
• The Type II-Plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor
• Time-dependent Effects in Photospheric-Phase Type II Supernova Spectra
• Cluster Difference Imaging Photometric Survey. I. Light Curves of Stars in Open Clusters from TESS Sectors 6 & 7
• Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results
• Connecting the progenitors, pre-explosion variability, and giant outbursts of luminous blue variables with Gaia16cfr
• SN 2019ehk: A Double-Peaked Ca-rich Transient with Luminous X-ray Emission and Shock-Ionized Spectral Features
• The Supernova Progenitor Mass Distributions of M31 and M33: Further Evidence for an Upper Mass Limit
• Analytic, dust-independent mass-loss rates for red supergiant winds initiated by turbulent pressure
• Emission line models for the lowest-mass core collapse supernovae. I: Case study of a 9 $M_{\odot }$ one-dimensional neutrino-driven explosion
• On the Progenitor of the Type IIb Supernova 2016gkg
• Radiation-hydrodynamical modelling of underluminous type II plateau Supernovae
• After the Fall: Late-Time Spectroscopy of Type IIP Supernovae
• High-Cadence, Early-Time Observations of Core-Collapse Supernovae From the TESS Prime Mission
• Supernova 2017eaw: molecule and dust formation from infrared observations
• Carnegie Supernova Project-II: Near-infrared Spectroscopic Diversity of Type II Supernovae
• GALEX Spectroscopy of SN 2005ay suggests a UV spectral uniformity among type II-P supernovae
• Supernova 2018cuf: A Type IIP supernova with a slow fall from plateau
• SN 2015an: a normal luminosity type II supernova with low expansion velocity at early phases